The distolingual cusp of the tooth #30 fractures (Fig.17 *) 5 years 5 months post cementation of #31.  In fact the tooth #30 is vital; the apical radiolucency (>)  is a normal trabecular structure under CT study.

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Xin Wei, DDS, PhD, MS 1st edition 04/12/2021, last revision 04/12/2021